01 December, 2001

Trap for increasing 12 m image rejection of the K2

Several K2 owners have had interference from broadcast images. This image band overlaps with the 19 m broadcast band as found by subtracting twice the 4.915 MHz intermediate frequency. The 12 m band image rejection, before the trap modification, on my K2 was 48 dB (preamp on). It improves to 59 dB with the trap. The trap is simple to build on a small piece of board and can easily be fitted on top of the RF-board.